In a statement, the Independent Parliamentary Standards Authority (IPSA) said: “This is in line with our determination on MPs’ pay, published in July 2015, where we committed to adjusting MPs’ pay for the rest of this Parliament at the same rate as changes in public sector earnings published by the Office for National Statistics.

“The ONS index takes account of promotions and bonuses which may explain why the figure is higher than the one per cent wider public sector pay policy.”

Last year, the chancellor announced public sector pay will be capped at a maximum of 1 per cent rise in each year,